Any recommendations for bars/restaurants that have a good (or decent) selection of vintage port by the glass in Porto and Lisbon? I was in Porto last year, and tawnys and colheitas seemed to offered by the glass almost everywhere, but vintage port less so. I'm going back in a week, this time also spending a few days in Lisbon.

I suggest that one place to try would be the Graham Lodge. Last time I was there the Vintage Room and the shop offered a small selection of port by the glass. I think I had Malvedos 1996 in summer last year.